package com.bwie.filter;

import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @projectName: server-2211a-shop
 * @package: com.bwie.filter
 * @className: MyGlobalFilter
 * @author: 杨珂
 * @description: TODO
 * @date: 2025/5/22 10:22
 * @version: 1.0
 */
@Configuration
@Order(-1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //获取参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径：" + url);


        //设置白名单
        if (url.contains("/login")) {
            System.out.println("白名单" + url);
            return chain.filter(exchange);
        }

        //获取token
        String token = request.getHeaders().getFirst("token");
        if (token == null || token.isEmpty()) {
            System.out.println("token不能为空");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Integer userId = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody().get("userId", Integer.class);
        String key = "token-" + userId;

        String redisToken = redisTemplate.opsForValue().get(key);
        if (redisToken == null || redisToken.isEmpty()) {
            System.out.println("token已过期" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if (!token.equals(redisToken)) {
            System.out.println("token错误" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //token续期
        redisTemplate.expire(key, 60, TimeUnit.MINUTES);

        //放行
        return chain.filter(exchange);
    }
}
